JP2024046168A - Annular metal seal, fitting structure for annular metal seal and fitting method of annular metal seal - Google Patents

Abstract

To reduce damage to a first member and a second member and load on a fastening bolt.SOLUTION: An annular metal seal 10 which is pressed by a second member 2 and deforms in the state that it is engaged in an annular seal groove 4 of a first member 1, includes: an annular seal body 10a; a pair of upper and lower tapered first projections 11, 12 which protrude from an upper surface and a lower surface of the seal body 10a, respectively, and correspond to an outer periphery side corner part R1 of the seal groove 4; a pair of upper and lower tapered second projections 13, 14 which protrude from an upper surface and a lower surface of the seal body 10a, respectively, and correspond to an inner peripheral surface corner part R2 of the seal groove 4; and a positioning projection 20 swelling from at least either an outer diameter side or an inner diameter side of the seal body 10a. A height from an upper and lower center C of the pair of upper and lower second projections 13, 14 differs from a height from an upper lower center C of the pair of upper and lower first projections 11, 12.SELECTED DRAWING: Figure 1

Description

The present invention relates to an annular metal seal, an installation structure for an annular metal seal, and an installation method for an annular metal seal.

Conventionally, for example, as shown in FIG. 4(a), in a metal seal 210 that is entirely annular and interposed between a pair of mutually parallel flat surfaces 201 and 202, an intermediate base 210a and an upper flat surface are provided. 202, and a second contact protrusion 211 that abuts on the lower flat surface 201. Two contact protrusions 211 are provided protruding near the outer diameter of the intermediate base 210a, and the pressing force received from the pair of flat surfaces 201 and 202 in the mounted and compressed state causes torsional elastic deformation to rotate around the intermediate base 210a. An annular metal seal 210 configured as described above is known (for example, see Patent Document 1).

Patent No. 4091373

For example, as shown in FIG. 4(b), this annular metal seal 210 has R-shaped protrusions (first contact protrusion 214 and second contact protrusion 211) arranged asymmetrically on the upper and lower surfaces, and corners 212, 213 that come into contact with the upper and lower flanges (flat surfaces 201, 202). This causes plastic deformation of the metal material and generates a reaction force against the upper and lower flanges, requiring a very high compressive load, which causes significant damage to the upper and lower flanges and places a large load on the tightening bolts used for tightening.

The present invention has been made in view of this point, and its purpose is to reduce damage to the first member and the second member and load on the tightening bolt.

In order to achieve the above object, in the present invention, the shape of the protrusions on the upper and lower surfaces of the annular metal seal is devised.

in particular,
In the first invention,
Installation of an annular metal seal in which the inside and outside of the annular metal seal are sealed by being pressed and deformed by a second member while the annular metal seal is fitted into an annular seal groove of a first member. The structure is
Targeting an annular metal seal that is pressed and deformed by a second member while being fitted into an annular seal groove of a first member,
The annular metal seal is
an annular seal body;
a pair of upper and lower tapered first protrusions that respectively protrude from the upper and lower surfaces of the seal body and correspond to the outer peripheral corner portions of the seal groove;
a pair of upper and lower tapered second protrusions that respectively protrude from the upper and lower surfaces of the seal body and correspond to the inner corner of the seal groove;
a positioning protrusion protruding from at least one side surface of the outer diameter side and the inner diameter side of the seal body;
The height of the pair of upper and lower second protrusions from the vertical center is different from the height of the pair of upper and lower first protrusions from the vertical center.

Here, the meaning of "tapered" means that the tip is narrower than the base of the protrusion. According to the above configuration, the tapered first and second protrusions protruding from the upper and lower surfaces of the annular seal body are deformed so as to be crushed from the tip when the annular metal seal is fitted into the annular seal groove of the first member and pressed by the second member, so that the load required for deformation is less than that of non-tapered protrusions, and damage to the first and second members and the load on the tightening bolt are reduced. Both the first and second protrusions on the upper and lower surfaces deform to exhibit sealing performance, so leakage between the first and second members is reliably prevented. Furthermore, the positioning protrusion maintains the distance between the inner surface of the seal groove and the first or second protrusion, preventing interference with the R portion of the corner of the seal groove and stabilizing the sealing performance. In addition, the height from the vertical center of the pair of upper and lower second ridges is different from the height from the vertical center of the pair of upper and lower first ridges, so the lower ridge is less likely to be damaged when it comes into contact with the outside when dropped or handled, and even if the taller ridge is damaged, the lower upper and lower ridges ensure sealing performance.

In the second invention, in the first invention,
The positioning protrusion bulges out from the outer diameter side surface of the seal body,
The height of the pair of upper and lower second protrusions from the vertical center is lower than the height of the pair of upper and lower first protrusions from the vertical center.

According to the above configuration, the distance between the inner surface of the seal groove and the first protrusion is maintained by the positioning protrusion, interference with the R portion of the corner of the seal groove is prevented, and sealing performance is stabilized. In addition, since the height of the second protrusion on the inner diameter side is lower than the first protrusion on the outer diameter side, the second protrusion is less likely to be damaged when it comes into contact with the outside during dropping or handling. Even if the first protrusion is damaged, the sealing performance is ensured by the upper and lower second protrusions.

In the mounting structure of the annular metal seal of the third invention,
A mounting structure for an annular metal seal in which an annular metal seal is fitted into an annular seal groove of a first member and is pressed and deformed by a second member to seal an inside and an outside of the annular metal seal,
The annular metal seal is
An annular seal body;
a pair of upper and lower tapered first protrusions protruding from an upper surface and a lower surface of the seal body, respectively, and corresponding to outer circumferential corner portions of the seal groove;
a pair of upper and lower tapered second protrusions protruding from an upper surface and a lower surface of the seal body, respectively, and corresponding to an inner peripheral corner portion of the seal groove;
a positioning projection protruding from at least one of the outer diameter side and the inner diameter side of the seal body,
a height from the vertical center of the pair of upper and lower second protrusions is different from a height from the vertical center of the pair of upper and lower first protrusions,
The inside and outside of the annular metal seal are sealed by clamping the first member and the second member together to deform the annular metal seal.

According to the above configuration, the tapered first and second ridges protruding from the upper and lower surfaces of the annular seal body are deformed so as to be crushed from the tip when the annular metal seal is fitted into the annular seal groove of the first member and pressed down by the second member, so that the load required for deformation is less than that of non-tapered ridges, and damage to the first and second members and the load on the tightening bolts are reduced. Both the first and second ridges on the upper and lower surfaces deform to exert sealing performance, so leakage between the first and second members is reliably prevented. Furthermore, the positioning protrusion maintains the distance between the inner surface of the seal groove and the first or second ridge, preventing interference with the R portion of the corner of the seal groove and stabilizing sealing performance. In addition, the height from the vertical center of the pair of upper and lower second ridges is different from the height from the vertical center of the pair of upper and lower first ridges, so the lower ridge is less likely to be damaged when it comes into contact with the outside when dropped or handled, and even if the taller ridge is damaged, the lower upper and lower ridges ensure sealing performance.

In a fourth aspect, in the third aspect,
The positioning projection protrudes from a side surface of the seal body on an outer diameter side,
The height of the pair of upper and lower second ridges from the vertical center is lower than the height of the pair of upper and lower first ridges from the vertical center.

With the above configuration, the positioning protrusion maintains the distance between the inner surface of the seal groove and the first ridge, preventing interference with the R portion of the corner of the seal groove and stabilizing sealing performance. In addition, the second ridge on the inner diameter side is lower in height than the first ridge on the outer diameter side, so the second ridge is less likely to be damaged when it comes into contact with the outside when dropped or handled, and even if the first ridge is damaged, the upper and lower second ridges ensure sealing performance.

A method for mounting an annular metal seal according to a fifth aspect of the present invention includes the steps of:
A method for installing an annular metal seal, in which the annular metal seal is fitted into an annular seal groove of a first member and is pressed and deformed by a second member to seal between an inside and an outside of the annular metal seal, comprising the steps of:
An annular seal body;
a pair of upper and lower tapered first protrusions protruding from an upper surface and a lower surface of the seal body, respectively, and corresponding to outer circumferential corner portions of the seal groove;
a pair of upper and lower tapered second protrusions protruding from an upper surface and a lower surface of the seal body, respectively, and corresponding to an inner peripheral corner portion of the seal groove;
a positioning projection protruding from at least one of the outer diameter side and the inner diameter side of the seal body,
The positioning projection protrudes from a side surface on an outer diameter side of the seal body,
preparing an annular metal seal in which a height from a vertical center of a pair of upper and lower second ridges is lower than a height from a vertical center of a pair of upper and lower first ridges;
the positioning projection is brought into contact with an outer side surface of the seal groove, and the annular metal seal is fitted into the seal groove in a state in which a first protrusion on a lower surface of the seal body is spaced away from an outer circumferential corner portion of the seal groove;
The first member and the second member are fastened together to deform the annular metal seal, thereby sealing the inside and outside of the annular metal seal.

According to the above configuration, the tapered first and second ridges protruding from the upper and lower surfaces of the annular seal body are deformed so as to be crushed from the tip when the annular metal seal is fitted into the annular seal groove of the first member and pressed by the second member, so that the load required for deformation is less than that of non-tapered ridges, and damage to the first and second members and the load on the tightening bolt are reduced. Both the first and second ridges on the upper and lower surfaces deform to exert sealing performance, so leakage between the first and second members is reliably prevented. In addition, the positioning protrusion maintains the distance between the inner surface of the seal groove and the first ridge, preventing interference with the R part of the corner of the seal groove, and stabilizing the sealing performance. Furthermore, since the height of the second ridge on the inner diameter side is lower than the first ridge on the outer diameter side, the second ridge is less likely to be damaged when it comes into contact with the outside during dropping or handling, and even if the first ridge is damaged, the upper and lower second ridges ensure sealing performance.

As explained above, according to the present invention, damage to the first member and the second member and load on the tightening bolt can be reduced.

FIG. 2 is a cross-sectional view showing an annular metal seal mounting structure including an annular metal seal according to an embodiment. FIG. 4 is an enlarged cross-sectional view showing the annular metal seal. 1 is a graph showing load characteristics according to an example and a comparative example. It is a figure which shows the result of analyzing the compression behavior concerning the annular metal seal based on a comparative example, (a) shows before compression, (b) shows during compression. It is a figure which shows the result of analyzing the compression behavior concerning the annular metal seal based on an Example, (a) shows before compression, (b) shows during compression. FIG. 3 is a view corresponding to FIG. 2 of an annular metal seal according to another embodiment. FIG. 2 is a cross-sectional view showing an annular metal seal mounting structure including a conventional annular metal seal.

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows an annular metal seal mounting structure 3 including an annular metal seal 10 according to an embodiment of the present invention.

In this annular metal seal mounting structure 3, the annular metal seal 10 is fitted into the annular seal groove 4 of the first member 1, and is pressed and deformed by the second member 2, thereby sealing the inside A and outside B of the annular metal seal 10. In this embodiment, the configurations of the first member 1 and the second member 2 are not specifically described, but for example, they are annular flange portions at the connection portion of a pair of pipes, and are configured so that a tightening bolt (not shown) is passed through the first bolt layer through hole 1a of the first member 1 and the second bolt insertion hole 2a of the second member 2 and tightened to a nut.

As shown in an enlarged view in FIG. 2, the annular metal seal 10 of this embodiment has, for example, first protrusions 11, 12 and second protrusions 13, 14 protruding from the upper and lower surfaces, which taper toward the tip. It has a seal main body 10a. The annular metal seal 10 is made of, for example, stainless steel, nickel alloy, copper, or the like.

Specifically, the annular metal seal 10 comprises an annular seal body 10a, a pair of upper and lower tapered first ridges 11, 12 that protrude from the upper and lower surfaces of the seal body 10a, respectively, and correspond to the outer circumferential corner R1 of the seal groove 4, and a pair of upper and lower tapered second ridges 13, 14 that protrude from the upper and lower surfaces of the seal body 10a, respectively, and correspond to the inner circumferential corner R2 of the seal groove 4. Here, "tapered" means that the tip of the ridge is thinner than the base.

The height of the upper and lower pair of second protrusions 13 and 14 from the vertical center C is different from the height of the upper and lower pair of first protrusions 11 and 12 from the vertical center C. In this embodiment, in particular, the height of the upper and lower pair of second protrusions 13 and 14 from the vertical center C is lower than the height of the upper and lower pair of first protrusions 11 and 12 from the vertical center C by h. In this embodiment, for example, the height of the upper and lower pair of first protrusions 11 and 12 from the vertical center C is 0.400 mm, and the height of the upper and lower pair of second protrusions 13 and 14 from the vertical center C is 0. .375mm and h=0.025mm.

In the mounting structure 3 for the annular metal seal of this embodiment, as shown in FIG. 1, a positioning protrusion 20 protrudes from the outer diameter side surface 10b of the annular metal seal 10.

In this way, the seal body 10a has a generally X-shaped cross section, and the positioning protrusion 20 is provided at the height center of the outer diameter side surface 10b of the seal body 10a. The height of the positioning protrusion 20 from the vertical center C is, for example, 0.3 mm, the width W from the tip of the first protrusion 11 to the outer diameter side surface 10b of the positioning protrusion 20 is, for example, 0.20 mm, and the radius r0 of the outer diameter side corner R1 is 0.1 mm, so W>r0.

In the mounting structure 3 of the annular metal seal of this embodiment, the positioning projection 20 abuts against the inner side surface 4a of the seal groove 4, and the tapered first protrusion 11 of the seal body 10a is separated from the outer diameter corner angle R1 of the seal groove 4. The annular metal seal 10 is fitted into the seal groove 4, and the first member 1 and the second member 2 are tightened to deform the annular metal seal 10, thereby sealing the inside A and outside B of the annular metal seal 10.

A gap S is provided between the inner side surface 4a of the seal groove 4 and the tip of the pointed protrusion 11 to prevent contact with the outer diameter corner R1 of the seal groove 4. In this embodiment, the gap S is kept at 0.2 mm or more (S>r0).

-How to install an annular metal seal-
First, the above-mentioned annular metal seal 10 is prepared.

Next, as shown in FIG. 1, the positioning protrusion 20 is brought into contact with the inner side surface 4a of the seal groove 4, and the first protrusion 11 of the seal body 10a is separated from the outer diameter side corner R1 of the seal groove 4. Then, the annular metal seal 10 is fitted into the seal groove 4. At this time, the positioning protrusion 20 comes into contact with the inner side surface 4a of the seal groove 4, and the protrusion amount W of the positioning protrusion 20 in the radial direction is equal to or larger than the radius r0 of the outer diameter side corner R1 of the seal groove 4. Because of this (W≧r0), the first protrusion 11 of the annular metal seal 10 is reliably spaced apart from the outer radius corner R1.

Next, the first member 1 and the second member 2 are fastened together with a fastening bolt or the like to deform the annular metal seal 10 and seal the inside A and outside B of the annular metal seal 10.

At this time, both the first ridges 11, 12 and the second ridges 13, 14 on the top and bottom surfaces deform to provide a seal, reliably preventing leakage between the first member 1 and the second member 2.

-Example-
A finite element method (FEM) analysis was performed on the load applied when the first member 1 and the second member 2 were fastened together. The analysis model was a two-dimensional axisymmetric analysis, and the materials were stainless steel and other metal materials having similar mechanical properties. As a comparative example, a model corresponding to the annular metal seal 210 having the shape shown in FIG. 4 was set, and as an example, a model of the annular metal seal 10 according to the above embodiment was set. Then, a pair of upper and lower compression plates corresponding to the first member 1 and the second member 2 were arranged on the upper and lower surfaces of these models, respectively.

Then, the interval (set height) between the pair of upper and lower compression plates was narrowed, and the annular metal seals of the models corresponding to the annular metal seal 210 according to the comparative example and the annular metal seal 10 according to the example were respectively deformed. Specifically, the comparative examples and examples were compressed from the initial height to a set height of 0.70 mm.

The load characteristics shown in Figure 3 are plots of the correlation between the reaction force generated on the pair of upper and lower compression plates and the set height.

As shown in FIG. 4(b), the annular metal seal 210 of the comparative example has R-shaped protrusions (first contact protrusion 214 and second contact protrusion 211) arranged asymmetrically on the top and bottom surfaces, and corners 212, 213 that come into contact with the top and bottom flanges (flat surfaces 201, 202). As a result, the metal material is plastically deformed and a reaction force is generated against the top and bottom flanges. As a result, the tip of the annular metal seal 210 of the comparative example is significantly deformed while tilting, and as shown in FIG. 3, a very high compressive load is required. This causes significant damage to the top and bottom flanges and also increases the load on the tightening bolts used for tightening.

On the other hand, as shown in FIG. 5(b), in the model according to the embodiment, only the tapered tips of the first ridges 11, 12 and the second ridges 13, 14 were crushed, without a large inclination as in the comparative example. Therefore, as shown by the solid line in FIG. 3, a load characteristic with a smaller inclination was obtained compared to the inclination of the comparative example. In other words, the compression load at the same set height was greatly reduced.

On the other hand, in the conventional example shown in FIG. 7, which does not have a positioning protrusion 20, the mounting structure 103 for the annular metal seal has an annular metal seal 110 that is sandwiched between the first plane 101a of the first member 101 and the second plane 102a of the second member 102 and is pressed by bringing the first plane 101a and the second plane 102a closer to each other.

For example, as shown in FIG. 7, a conventional annular metal seal 110 without a positioning protrusion 20 is used by being fitted into a seal groove 104 dug in the first member 101, and the annular metal seal 110 has a sharp protrusion. One of the protrusions 111 among the protrusions 111 to 114 comes into contact with the outer diameter corner R1 of the seal groove 104. The corner R1 on the outer diameter side of the seal groove 104 is normally an unavoidable shape when the seal groove 104 is machined. Therefore, the following problems may occur.

(1) The position of the annular metal seal 110 is unstable when tightened, and the reaction force or contact surface pressure is not generated normally.

(2) The outer diameter corner R1 slides radially, causing damage to the path connecting the areas to be sealed, which can lead to leakage.

However, in the annular metal seal 10 according to the present embodiment, as shown in FIG. Interference with the outer diameter side corner R1 of No. 4 is prevented. Therefore, the position of the annular metal seal 10 is stabilized during tightening, and a reaction force or contact surface pressure is normally generated. Further, there is no slippage in the radial direction at the outer diameter side corner R1, no damage occurs in the path direction connecting the area to be sealed, no leakage occurs, and the sealing performance is stable.

As described above, in this embodiment, the tapered first ridges 11, 12 and second ridges 13, 14 protruding from the upper and lower surfaces of the annular seal body 10a are deformed so as to be crushed from the tip when the annular metal seal 10 is fitted into the annular seal groove 4 of the first member 1 and pressed down by the second member 2. This means that less load is required for deformation than the non-tapered R-shaped ridges of the comparative example shown in Figure 4, reducing damage to the first member 1 and the second member 2 and the load on the tightening bolt.

Furthermore, the second ridges 13, 14 on the inner diameter side are lower in height than the first ridges 11, 12 on the outer diameter side, so the lower second ridges 13, 14 on the inner diameter side are less likely to be damaged when the tube comes into contact with the outside during dropping or handling. Even if the first ridges 11, 12 are damaged, the upper and lower second ridges 13, 14 ensure sealing performance.

As described above, this embodiment can reduce damage to the first member 1 and the second member 2 and the load on the tightening bolt.

(Other embodiments)
The present invention may have the following configuration for the above embodiment.

That is, in the above embodiment, the positioning protrusion 20 is bulged on the outer diameter side surface 10b of the seal body 10a, but as in the annular metal seal 10' shown in FIG. It may be made to bulge out on the inner side surface on the inner diameter side of 10a'. In this case as well, in order to prevent scratches when dropped, etc., the second protrusions 13', 14' on the inner diameter side are closer to the vertical center C than the first protrusions 11', 12' on the outer diameter side. It is desirable that the height is low. It goes without saying that the positioning protrusion may bulge out on both the outer and inner side surfaces.

In the above embodiment, the height from the vertical center C of the pair of upper and lower second ridges 13, 14 on the inner diameter side is lower than the height from the vertical center C of the pair of upper and lower first ridges 11, 12 on the outer diameter side, but the height from the vertical center C of the pair of upper and lower second ridges 13, 14 on the inner diameter side may be higher than the height from the vertical center C of the pair of upper and lower first ridges 11, 12 on the outer diameter side. Even in this case, the lower ridge is less likely to be damaged when it comes into contact with the outside during dropping or handling, and even if the higher ridge is damaged, the lower ridge ensures sealing performance. However, it is advantageous to lower the height from the vertical center C of the pair of upper and lower second ridges 13, 14 on the inner diameter side, which is easier to avoid contact with the outside, because this can reliably prevent damage and ensures sealing performance by at least the pair of upper and lower second ridges 13, 14.

Note that the above embodiments are essentially preferred examples and are not intended to limit the scope of the present invention, its applications, or uses.

1 First member
1a First bolt layer through hole
2a Second bolt insertion hole
2 Second member
3. Mounting structure
4 Seal groove
4a Inner side
10 Annular metal seal
10a Seal body
10b Outer diameter side surface
11, 12 First protrusion
13, 14 Second protrusion
20 Positioning protrusion 101 First member 101a First flat surface 102 Second member 102a Second flat surface 103 Mounting structure 104 Seal groove 110 Annular metal seal 111 to 114 Ridge 201, 202 Flat surface 210 Annular metal seal 211 Second contact protrusion 212, 213 Corner 214 First contact protrusion

in particular,
In the first invention ,
The present invention is directed to an annular metal seal that is fitted into an annular seal groove of a first member and is pressed and deformed by a second member,
The annular metal seal is
An annular seal body;
a pair of upper and lower tapered first protrusions protruding from an upper surface and a lower surface of the seal body, respectively, and corresponding to outer circumferential corner portions of the seal groove;
a pair of upper and lower tapered second protrusions protruding from an upper surface and a lower surface of the seal body, respectively, and corresponding to an inner peripheral corner portion of the seal groove;
a positioning projection protruding from at least one of the outer diameter side and the inner diameter side of the seal body,
The height of the pair of upper and lower second ridges from the vertical center is different from the height of the pair of upper and lower first ridges from the vertical center.

In this annular metal seal mounting structure 3, the annular metal seal 10 is pressed and deformed by the second member 2 while being fitted into the annular seal groove 4 of the first member 1. The inside A and the outside B of 10 are sealed. In this embodiment, the configurations of the first member 1 and the second member 2 will not be specifically explained, but for example, they are annular flange portions at the connecting portion of a pair of pipes, and the first bolts of the first member 1 are inserted. A tightening bolt (not shown) is passed through the through hole 1a and the second bolt insertion hole 2a of the second member 2 so as to be tightened to a nut.

1 First member
1a 1st bolt insertion hole
2a 2nd bolt insertion hole
2 Second member
3 Mounting structure
4 Seal groove
4a Medial side
10 Ring metal seal
10a Seal body
10b Outer diameter side surface
11, 12 First protrusion
13,14 Second protrusion
20 Positioning protrusion 101 First member 101a First plane 102 Second member 102a Second plane 103 Mounting structure 104 Seal groove 110 Annular metal seal 111-114 Projection 201, 202 Flat surface 210 Annular metal seal 211 Second contact convex portion 212, 213 corner portion 214 first contact convex portion

Claims (5)

An annular metal seal that is fitted into an annular seal groove of a first member and is pressed and deformed by a second member,
An annular seal body;
a pair of upper and lower tapered first protrusions protruding from an upper surface and a lower surface of the seal body, respectively, and corresponding to outer circumferential corner portions of the seal groove;
a pair of upper and lower tapered second protrusions protruding from an upper surface and a lower surface of the seal body, respectively, and corresponding to an inner peripheral corner portion of the seal groove;
a positioning projection protruding from at least one of the outer diameter side and the inner diameter side of the seal body,
1. An annular metal seal comprising: a pair of upper and lower second ridges having a different height from the vertical center; and a pair of upper and lower first ridges having a different height from the vertical center. The positioning projection protrudes from a side surface of the seal body on an outer diameter side,
2. The annular metal seal according to claim 1, wherein a height of the pair of upper and lower second ridges from the vertical center is lower than a height of the pair of upper and lower first ridges from the vertical center. A mounting structure for an annular metal seal in which an annular metal seal is fitted into an annular seal groove of a first member and is pressed and deformed by a second member to seal an inside and an outside of the annular metal seal,
The annular metal seal is
An annular seal body;
a pair of upper and lower tapered first protrusions protruding from an upper surface and a lower surface of the seal body, respectively, and corresponding to outer circumferential corner portions of the seal groove;
a pair of upper and lower tapered second protrusions protruding from an upper surface and a lower surface of the seal body, respectively, and corresponding to an inner peripheral corner portion of the seal groove;
a positioning projection protruding from at least one of the outer diameter side and the inner diameter side of the seal body,
a height from the vertical center of the pair of upper and lower second protrusions is different from a height from the vertical center of the pair of upper and lower first protrusions,
An installation structure for an annular metal seal, characterized in that the inside and outside of the annular metal seal are sealed by tightening the first member and the second member to deform the annular metal seal. The positioning projection protrudes from a side surface of the seal body on an outer diameter side,
4. The mounting structure for an annular metal seal according to claim 3, wherein a height of the pair of upper and lower second ridges from the vertical center is lower than a height of the pair of upper and lower first ridges from the vertical center. A method for installing an annular metal seal in which the annular metal seal is fitted into an annular seal groove of a first member and is pressed and deformed by a second member to seal the inside and outside of the annular metal seal. And,
an annular seal body;
a pair of upper and lower tapered first protrusions that respectively protrude from the upper and lower surfaces of the seal body and correspond to the outer peripheral corner portions of the seal groove;
a pair of upper and lower tapered second protrusions that respectively protrude from the upper and lower surfaces of the seal body and correspond to the inner peripheral corner portions of the seal groove;
a positioning protrusion protruding from at least one side surface of the outer diameter side and the inner diameter side of the seal body;
the positioning protrusion protrudes from a side surface on the outer diameter side of the seal body;
preparing an annular metal seal in which the height of the pair of upper and lower second protrusions from the vertical center is lower than the height of the pair of upper and lower first protrusions from the vertical center;
With the positioning protrusion in contact with the outer side surface of the seal groove and the first protrusion on the lower surface of the seal body separated from the outer corner of the seal groove, insert the annular metal seal into the seal groove. Insert the
A method for attaching an annular metal seal, comprising tightening the first member and the second member to deform the annular metal seal and sealing the inside and outside of the annular metal seal.